Hello,
I have good skill and good experience with same thing. I develop one product for one company where I use same things. I had good skill and idea to develop this thing and will do it for you.
Relevant Skills and Experience
More details will discuss over chat.
ESP8266, ESP-01, NodeMCU, RS485 modbus rtu, c, c++, arduino, max485, ESP32
Proposed Milestones
$208 SGD - multi-master modbus on ESP32
Can you please provide more information which help to develop this more better please share it